In $$\mathrm{BrF}_3$$ molecule, the lone pairs occupy equatorial positions to minimise

Which one of the following is/are linear structure?

I. $$\mathrm{I}_3^{-}$$

II. $$\mathrm{NO}_2^{-}$$

III. $$\mathrm{I}_3^{+}$$

IV. $$\mathrm{SO}_2$$

V. $$\mathrm{N}_3^{-}$$

OF and F₂ can be compared in terms of